Have an explicit title on Community/Business (#599)

Author: ericholscher

readthedocsext/theme/templates/base.html

@@ -7,7 +7,7 @@
 
     {# Hide weird spaces in title #}
     {# djlint:off #}
-    <title>{% block title %}{% endblock title %}{% block head_title %}{% endblock head_title %} - Read the Docs</title>
+    <title>{% block title %}{% endblock title %}{% block head_title %}{% endblock head_title %} - Read the Docs{% if "readthedocs.org" in PRODUCTION_DOMAIN %} Community {% elif "readthedocs.com" in PRODUCTION_DOMAIN %} Business {% elif "devthedocs" in PRODUCTION_DOMAIN %} Dev {% endif%}</title>
     {# djlint:on #}
 
     {% block head_meta %}